forked from OSchip/llvm-project
[ARM] Enable GEP offset splitting for 32-bit ARM.
It has essentially the same benefit it has on 64-bit ARM: it substantially reduces the number of constants used by large GEP operations. Seems to be generally helpful across a few different codebases I've tried. Differential Revision: https://reviews.llvm.org/D51462 llvm-svn: 341136
This commit is contained in:
Eli Friedman
parent
f5415179bc
commit
d5d0a4d27f
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@ -770,6 +770,8 @@ class VectorType;
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bool mayBeEmittedAsTailCall(const CallInst *CI) const override;
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bool shouldConsiderGEPOffsetSplit() const override { return true; }
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SDValue getCMOV(const SDLoc &dl, EVT VT, SDValue FalseVal, SDValue TrueVal,
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SDValue ARMcc, SDValue CCR, SDValue Cmp,
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SelectionDAG &DAG) const;
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@ -0,0 +1,157 @@
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; RUN: llc -mtriple=armv6m-linux-gnueabi -verify-machineinstrs -o - %s -disable-constant-hoisting | FileCheck %s
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%struct_type = type { [10000 x i32], i32, i32 }
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define void @test1(%struct_type** %s, i32 %n) {
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; CHECK-LABEL: test1
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entry:
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%struct = load %struct_type*, %struct_type** %s
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br label %while_cond
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while_cond:
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%phi = phi i32 [ 0, %entry ], [ %i, %while_body ]
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%gep0 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 1
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%gep1 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 2
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%cmp = icmp slt i32 %phi, %n
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br i1 %cmp, label %while_body, label %while_end
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while_body:
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; CHECK: str r{{[0-9]+}}, [r{{[0-9]+}}]
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; CHECK-NEXT: str r{{[0-9]+}}, [r{{[0-9]+}}, #4]
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%i = add i32 %phi, 1
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store i32 %i, i32* %gep0
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store i32 %phi, i32* %gep1
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br label %while_cond
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while_end:
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ret void
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; CHECK: .LCPI0_0:
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; CHECK-NEXT: .long 40000
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; CHECK-NOT: LCPI0
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}
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define void @test2(%struct_type* %struct, i32 %n) {
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; CHECK-LABEL: test2
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entry:
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%cmp = icmp eq %struct_type* %struct, null
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br i1 %cmp, label %while_end, label %while_cond
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while_cond:
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%phi = phi i32 [ 0, %entry ], [ %i, %while_body ]
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%gep0 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 1
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%gep1 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 2
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%cmp1 = icmp slt i32 %phi, %n
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br i1 %cmp1, label %while_body, label %while_end
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while_body:
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; CHECK: str r{{[0-9]+}}, [r{{[0-9]+}}]
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; CHECK-NEXT: str r{{[0-9]+}}, [r{{[0-9]+}}, #4]
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%i = add i32 %phi, 1
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store i32 %i, i32* %gep0
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store i32 %phi, i32* %gep1
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br label %while_cond
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while_end:
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ret void
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; CHECK: .LCPI1_0:
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; CHECK-NEXT: .long 40000
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; CHECK-NOT: LCPI1
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}
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define void @test3(%struct_type* %s1, %struct_type* %s2, i1 %cond, i32 %n) {
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; CHECK-LABEL: test3
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entry:
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br i1 %cond, label %if_true, label %if_end
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if_true:
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br label %if_end
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if_end:
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%struct = phi %struct_type* [ %s1, %entry ], [ %s2, %if_true ]
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%cmp = icmp eq %struct_type* %struct, null
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br i1 %cmp, label %while_end, label %while_cond
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while_cond:
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%phi = phi i32 [ 0, %if_end ], [ %i, %while_body ]
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%gep0 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 1
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%gep1 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 2
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%cmp1 = icmp slt i32 %phi, %n
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br i1 %cmp1, label %while_body, label %while_end
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while_body:
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; CHECK: str r{{[0-9]+}}, [r{{[0-9]+}}]
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; CHECK-NEXT: str r{{[0-9]+}}, [r{{[0-9]+}}, #4]
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%i = add i32 %phi, 1
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store i32 %i, i32* %gep0
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store i32 %phi, i32* %gep1
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br label %while_cond
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while_end:
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ret void
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; CHECK: .LCPI2_0:
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; CHECK-NEXT: .long 40000
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; CHECK-NOT: LCPI2
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}
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declare %struct_type* @foo()
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define void @test4(i32 %n) personality i32 (...)* @__FrameHandler {
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; CHECK-LABEL: test4
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entry:
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%struct = invoke %struct_type* @foo() to label %while_cond unwind label %cleanup
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while_cond:
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%phi = phi i32 [ 0, %entry ], [ %i, %while_body ]
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%gep0 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 1
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%gep1 = getelementptr %struct_type, %struct_type* %struct, i64 0, i32 2
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%cmp = icmp slt i32 %phi, %n
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br i1 %cmp, label %while_body, label %while_end
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while_body:
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; CHECK: str r{{[0-9]+}}, [r{{[0-9]+}}]
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; CHECK-NEXT: str r{{[0-9]+}}, [r{{[0-9]+}}, #4]
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%i = add i32 %phi, 1
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store i32 %i, i32* %gep0
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store i32 %phi, i32* %gep1
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br label %while_cond
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while_end:
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ret void
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cleanup:
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landingpad { i8*, i32 } cleanup
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unreachable
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; CHECK: .LCPI3_0:
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; CHECK-NEXT: .long 40000
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; CHECK-NOT: LCPI3
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}
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declare i32 @__FrameHandler(...)
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define void @test5([65536 x i32]** %s, i32 %n) {
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; CHECK-LABEL: test5
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entry:
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%struct = load [65536 x i32]*, [65536 x i32]** %s
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br label %while_cond
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while_cond:
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%phi = phi i32 [ 0, %entry ], [ %i, %while_body ]
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%gep0 = getelementptr [65536 x i32], [65536 x i32]* %struct, i64 0, i32 20000
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%gep1 = getelementptr [65536 x i32], [65536 x i32]* %struct, i64 0, i32 20001
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%cmp = icmp slt i32 %phi, %n
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br i1 %cmp, label %while_body, label %while_end
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while_body:
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; CHECK: str r{{[0-9]+}}, [r{{[0-9]+}}]
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; CHECK-NEXT: str r{{[0-9]+}}, [r{{[0-9]+}}, #4]
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%i = add i32 %phi, 1
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store i32 %i, i32* %gep0
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store i32 %phi, i32* %gep1
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br label %while_cond
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while_end:
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ret void
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; CHECK: .LCPI4_0:
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; CHECK-NEXT: .long 80000
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; CHECK-NOT: LCPI4
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}
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