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llvm-project/llvm/test/CodeGen/X86/narrow-shl-load.ll

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Fix DAGCombiner to avoid folding a sext-in-reg or similar through a shl in order to fold it into a load. llvm-svn: 118471
2010-11-09 09:54:35 +08:00
; RUN: llc -march=x86-64 < %s | FileCheck %s
Fix DAGCombiner to avoid going into an infinite loop when it encounters (and:i64 (shl:i64 (load:i64), 1), 0xffffffff). This fixes rdar://8606584. llvm-svn: 118143
2010-11-03 09:47:46 +08:00
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-pc-linux-gnu"
Fix DAGCombiner to avoid folding a sext-in-reg or similar through a shl in order to fold it into a load. llvm-svn: 118471
2010-11-09 09:54:35 +08:00
; DAGCombiner should fold this code in finite time.
; rdar://8606584
Fix a bug in ReduceLoadWidth that wasn't handling extending loads properly. We miscompiled the testcase into: _test: ## @test movl $128, (%rdi) movzbl 1(%rdi), %eax ret Now we get a proper: _test: ## @test movl $128, (%rdi) movsbl (%rdi), %eax movzbl %ah, %eax ret This fixes PR8757. llvm-svn: 122392
2010-12-22 16:02:57 +08:00
define void @test1() nounwind readnone {
Fix DAGCombiner to avoid going into an infinite loop when it encounters (and:i64 (shl:i64 (load:i64), 1), 0xffffffff). This fixes rdar://8606584. llvm-svn: 118143
2010-11-03 09:47:46 +08:00
bb.nph:
br label %while.cond
while.cond: ; preds = %while.cond, %bb.nph
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%tmp6 = load i32, i32* undef, align 4
Fix DAGCombiner to avoid going into an infinite loop when it encounters (and:i64 (shl:i64 (load:i64), 1), 0xffffffff). This fixes rdar://8606584. llvm-svn: 118143
2010-11-03 09:47:46 +08:00
%and = or i64 undef, undef
%conv11 = zext i32 undef to i64
%conv14 = zext i32 %tmp6 to i64
%shl15 = shl i64 %conv14, 1
%shl15.masked = and i64 %shl15, 4294967294
%and17 = or i64 %shl15.masked, %conv11
%add = add i64 %and17, 1
%xor = xor i64 %add, %and
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%tmp20 = load i64, i64* undef, align 8
Fix DAGCombiner to avoid going into an infinite loop when it encounters (and:i64 (shl:i64 (load:i64), 1), 0xffffffff). This fixes rdar://8606584. llvm-svn: 118143
2010-11-03 09:47:46 +08:00
%add21 = add i64 %xor, %tmp20
%conv22 = trunc i64 %add21 to i32
store i32 %conv22, i32* undef, align 4
br i1 false, label %while.end, label %while.cond
while.end: ; preds = %while.cond
ret void
}
Fix DAGCombiner to avoid folding a sext-in-reg or similar through a shl in order to fold it into a load. llvm-svn: 118471
2010-11-09 09:54:35 +08:00
Fix a bug in ReduceLoadWidth that wasn't handling extending loads properly. We miscompiled the testcase into: _test: ## @test movl $128, (%rdi) movzbl 1(%rdi), %eax ret Now we get a proper: _test: ## @test movl $128, (%rdi) movsbl (%rdi), %eax movzbl %ah, %eax ret This fixes PR8757. llvm-svn: 122392
2010-12-22 16:02:57 +08:00
; DAG Combiner can't fold this into a load of the 1'th byte.
; PR8757
define i32 @test3(i32 *%P) nounwind ssp {
Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. llvm-svn: 145171
2011-11-27 14:54:59 +08:00
store volatile i32 128, i32* %P
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%tmp4.pre = load i32, i32* %P
Fix a bug in ReduceLoadWidth that wasn't handling extending loads properly. We miscompiled the testcase into: _test: ## @test movl $128, (%rdi) movzbl 1(%rdi), %eax ret Now we get a proper: _test: ## @test movl $128, (%rdi) movsbl (%rdi), %eax movzbl %ah, %eax ret This fixes PR8757. llvm-svn: 122392
2010-12-22 16:02:57 +08:00
%phitmp = trunc i32 %tmp4.pre to i16
%phitmp13 = shl i16 %phitmp, 8
%phitmp14 = ashr i16 %phitmp13, 8
%phitmp15 = lshr i16 %phitmp14, 8
%phitmp16 = zext i16 %phitmp15 to i32
ret i32 %phitmp16
; CHECK: movl $128, (%rdi)
; CHECK-NEXT: movsbl (%rdi), %eax
; CHECK-NEXT: movzbl %ah, %eax
; CHECK-NEXT: ret
}