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Smarter isel of ldrsb / ldrsh. Only make use of these when [r,r] address is feasible.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75360 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-07-11 07:08:13 +00:00
parent 446c428bf3
commit 2f297df02e
4 changed files with 27 additions and 24 deletions
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17
test/CodeGen/Thumb/ldr_ext.ll
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@@ -1,27 +1,34 @@
; RUN: llvm-as < %s | llc -march=thumb | grep ldrb | count 1
; RUN: llvm-as < %s | llc -march=thumb | grep ldrh | count 1
; RUN: llvm-as < %s | llc -march=thumb | grep ldrsb | count 1
; RUN: llvm-as < %s | llc -march=thumb | grep ldrsh | count 1
; RUN: llvm-as < %s | llc -march=thumb | FileCheck %s
define i32 @test1(i8* %v.pntr.s0.u1) {
; CHECK: test1:
; CHECK: ldrb
%tmp.u = load i8* %v.pntr.s0.u1
%tmp1.s = zext i8 %tmp.u to i32
ret i32 %tmp1.s
}
define i32 @test2(i16* %v.pntr.s0.u1) {
; CHECK: test2:
; CHECK: ldrh
%tmp.u = load i16* %v.pntr.s0.u1
%tmp1.s = zext i16 %tmp.u to i32
ret i32 %tmp1.s
}
define i32 @test3(i8* %v.pntr.s1.u0) {
%tmp.s = load i8* %v.pntr.s1.u0
; CHECK: test3:
; CHECK: ldrb
; CHECK: sxtb
%tmp.s = load i8* %v.pntr.s1.u0
%tmp1.s = sext i8 %tmp.s to i32
ret i32 %tmp1.s
}
define i32 @test4() {
; CHECK: test4:
; CHECK: movs
; CHECK: ldrsh
%tmp.s = load i16* null
%tmp1.s = sext i16 %tmp.s to i32
ret i32 %tmp1.s