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1ead7346cd
In particular, this makes the code for 64-bit compares on 32-bit targets
much more efficient.
Example:
define i32 @test_slt(i64 %a, i64 %b) {
entry:
%cmp = icmp slt i64 %a, %b
br i1 %cmp, label %bb1, label %bb2
bb1:
ret i32 1
bb2:
ret i32 2
}
Before this patch:
test_slt:
movl 4(%esp), %eax
movl 8(%esp), %ecx
cmpl 12(%esp), %eax
setae %al
cmpl 16(%esp), %ecx
setge %cl
je .LBB2_2
movb %cl, %al
.LBB2_2:
testb %al, %al
jne .LBB2_4
movl $1, %eax
retl
.LBB2_4:
movl $2, %eax
retl
After this patch:
test_slt:
movl 4(%esp), %eax
movl 8(%esp), %ecx
cmpl 12(%esp), %eax
sbbl 16(%esp), %ecx
jge .LBB1_2
movl $1, %eax
retl
.LBB1_2:
movl $2, %eax
retl
Differential Revision: http://reviews.llvm.org/D14496
llvm-svn: 253572
31 lines
1.2 KiB
LLVM
31 lines
1.2 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; Check that an overly large immediate created by SROA doesn't crash the
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; legalizer.
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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-S128"
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target triple = "x86_64-apple-macosx10.8.0"
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%struct._GtkSheetRow = type { i32*, i32, i32, i32, %struct._GtkSheetButton, i32, i32 }
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%struct._GtkSheetButton = type { i32, i32*, i32, i32*, i32 }
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@a = common global %struct._GtkSheetRow* null, align 8
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define void @fn1() nounwind uwtable ssp {
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entry:
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%0 = load %struct._GtkSheetRow*, %struct._GtkSheetRow** @a, align 8
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%1 = bitcast %struct._GtkSheetRow* %0 to i576*
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%srcval2 = load i576, i576* %1, align 8
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%tobool = icmp ugt i576 %srcval2, 57586096570152913699974892898380567793532123114264532903689671329431521032595044740083720782129802971518987656109067457577065805510327036019308994315074097345724415
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br i1 %tobool, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i576 %srcval2, i576* %1, align 8
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br label %if.end
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if.end: ; preds = %if.then, %entry
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ret void
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; CHECK-LABEL: fn1:
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; CHECK: jb
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}
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