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llvm-project/llvm/test/CodeGen/X86/stack-align.ll

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Add support for the 'alignstack' attribute to the x86 backend. Fixes PR5254. Also, FileCheck'ize a test. llvm-svn: 96686
2010-02-20 02:17:13 +08:00
; RUN: llc < %s -relocation-model=static -realign-stack=1 -mcpu=yonah | FileCheck %s
Infer alignment of loads and increase their alignment when we can tell they are from the stack. This allows us to compile stack-align.ll to: _test: movsd LCPI1_0, %xmm0 movapd %xmm0, %xmm1 *** andpd 4(%esp), %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret instead of: _test: movsd LCPI1_0, %xmm0 ** movsd 4(%esp), %xmm1 ** andpd %xmm0, %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret llvm-svn: 46401
2008-01-27 03:45:50 +08:00
; The double argument is at 4(esp) which is 16-byte aligned, allowing us to
; fold the load into the andpd.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-apple-darwin8"
@G = external global double
define void @test({ double, double }* byval %z, double* %P) {
entry:
Teach two-address lowering how to unfold a load to open up commuting opportunities. For example, this lets it emit this: movq (%rax), %rcx addq %rdx, %rcx instead of this: movq %rdx, %rcx addq (%rax), %rcx in the case where %rdx has subsequent uses. It's the same number of instructions, and usually the same encoding size on x86, but it appears faster, and in general, it may allow better scheduling for the load. llvm-svn: 106493
2010-06-22 06:17:20 +08:00
%tmp3 = load double* @G, align 16 ; <double> [#uses=1]
%tmp4 = tail call double @fabs( double %tmp3 ) ; <double> [#uses=1]
volatile store double %tmp4, double* %P
Infer alignment of loads and increase their alignment when we can tell they are from the stack. This allows us to compile stack-align.ll to: _test: movsd LCPI1_0, %xmm0 movapd %xmm0, %xmm1 *** andpd 4(%esp), %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret instead of: _test: movsd LCPI1_0, %xmm0 ** movsd 4(%esp), %xmm1 ** andpd %xmm0, %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret llvm-svn: 46401
2008-01-27 03:45:50 +08:00
%tmp = getelementptr { double, double }* %z, i32 0, i32 0 ; <double*> [#uses=1]
Teach two-address lowering how to unfold a load to open up commuting opportunities. For example, this lets it emit this: movq (%rax), %rcx addq %rdx, %rcx instead of this: movq %rdx, %rcx addq (%rax), %rcx in the case where %rdx has subsequent uses. It's the same number of instructions, and usually the same encoding size on x86, but it appears faster, and in general, it may allow better scheduling for the load. llvm-svn: 106493
2010-06-22 06:17:20 +08:00
%tmp1 = volatile load double* %tmp, align 8 ; <double> [#uses=1]
Infer alignment of loads and increase their alignment when we can tell they are from the stack. This allows us to compile stack-align.ll to: _test: movsd LCPI1_0, %xmm0 movapd %xmm0, %xmm1 *** andpd 4(%esp), %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret instead of: _test: movsd LCPI1_0, %xmm0 ** movsd 4(%esp), %xmm1 ** andpd %xmm0, %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret llvm-svn: 46401
2008-01-27 03:45:50 +08:00
%tmp2 = tail call double @fabs( double %tmp1 ) ; <double> [#uses=1]
Add support for the 'alignstack' attribute to the x86 backend. Fixes PR5254. Also, FileCheck'ize a test. llvm-svn: 96686
2010-02-20 02:17:13 +08:00
; CHECK: andpd{{.*}}4(%esp), %xmm
Split the Add, Sub, and Mul instruction opcodes into separate integer and floating-point opcodes, introducing FAdd, FSub, and FMul. For now, the AsmParser, BitcodeReader, and IRBuilder all preserve backwards compatability, and the Core LLVM APIs preserve backwards compatibility for IR producers. Most front-ends won't need to change immediately. This implements the first step of the plan outlined here: http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt llvm-svn: 72897
2009-06-05 06:49:04 +08:00
%tmp6 = fadd double %tmp4, %tmp2 ; <double> [#uses=1]
Teach two-address lowering how to unfold a load to open up commuting opportunities. For example, this lets it emit this: movq (%rax), %rcx addq %rdx, %rcx instead of this: movq %rdx, %rcx addq (%rax), %rcx in the case where %rdx has subsequent uses. It's the same number of instructions, and usually the same encoding size on x86, but it appears faster, and in general, it may allow better scheduling for the load. llvm-svn: 106493
2010-06-22 06:17:20 +08:00
volatile store double %tmp6, double* %P, align 8
Infer alignment of loads and increase their alignment when we can tell they are from the stack. This allows us to compile stack-align.ll to: _test: movsd LCPI1_0, %xmm0 movapd %xmm0, %xmm1 *** andpd 4(%esp), %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret instead of: _test: movsd LCPI1_0, %xmm0 ** movsd 4(%esp), %xmm1 ** andpd %xmm0, %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret llvm-svn: 46401
2008-01-27 03:45:50 +08:00
ret void
}
Add support for the 'alignstack' attribute to the x86 backend. Fixes PR5254. Also, FileCheck'ize a test. llvm-svn: 96686
2010-02-20 02:17:13 +08:00
define void @test2() alignstack(16) {
entry:
; CHECK: andl{{.*}}$-16, %esp
ret void
}
; Use a call to force a spill.
define <2 x double> @test3(<2 x double> %x, <2 x double> %y) alignstack(32) {
entry:
; CHECK: andl{{.*}}$-32, %esp
call void @test2()
Fix tests to use fadd, fsub, and fmul, instead of add, sub, and mul, when the type is floating-point. llvm-svn: 102969
2010-05-04 06:36:46 +08:00
%A = fmul <2 x double> %x, %y
Add support for the 'alignstack' attribute to the x86 backend. Fixes PR5254. Also, FileCheck'ize a test. llvm-svn: 96686
2010-02-20 02:17:13 +08:00
ret <2 x double> %A
}
Infer alignment of loads and increase their alignment when we can tell they are from the stack. This allows us to compile stack-align.ll to: _test: movsd LCPI1_0, %xmm0 movapd %xmm0, %xmm1 *** andpd 4(%esp), %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret instead of: _test: movsd LCPI1_0, %xmm0 ** movsd 4(%esp), %xmm1 ** andpd %xmm0, %xmm1 andpd _G, %xmm0 addsd %xmm1, %xmm0 movl 20(%esp), %eax movsd %xmm0, (%eax) ret llvm-svn: 46401
2008-01-27 03:45:50 +08:00
declare double @fabs(double)
Add support for the 'alignstack' attribute to the x86 backend. Fixes PR5254. Also, FileCheck'ize a test. llvm-svn: 96686
2010-02-20 02:17:13 +08:00