diff options
Diffstat (limited to 'test/CodeGen/ARM/longMAC.ll')
| -rw-r--r-- | test/CodeGen/ARM/longMAC.ll | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/test/CodeGen/ARM/longMAC.ll b/test/CodeGen/ARM/longMAC.ll index 2cf91c3..5636a12 100644 --- a/test/CodeGen/ARM/longMAC.ll +++ b/test/CodeGen/ARM/longMAC.ll @@ -1,4 +1,5 @@ -; RUN: llc < %s -march=arm | FileCheck %s +; RUN: llc -mtriple=arm-eabi %s -o - | FileCheck %s +; RUN: llc -mtriple=armv7-eabi %s -o - | FileCheck %s --check-prefix=CHECK-V7 ; Check generated signed and unsigned multiply accumulate long. define i64 @MACLongTest1(i32 %a, i32 %b, i64 %c) { @@ -42,3 +43,28 @@ define i64 @MACLongTest4(i32 %a, i32 %b, i32 %c) { %add = add nsw i64 %mul, %conv2 ret i64 %add } + +; Two things to check here: the @earlyclobber constraint (on <= v5) and the "$Rd = $R" ones. +; + Without @earlyclobber the v7 code is natural. With it, the first two +; registers must be distinct from the third. +; + Without "$Rd = $R", this can be satisfied without a mov before the umlal +; by trying to use 6 different registers in the MachineInstr. The natural +; evolution of this attempt currently leaves only two movs in the final +; function, both after the umlal. With it, *some* move has to happen +; before the umlal. +define i64 @MACLongTest5(i64 %c, i32 %a, i32 %b) { +; CHECK-V7-LABEL: MACLongTest5: +; CHECK-V7-LABEL: umlal r0, r1, r0, r0 + +; CHECK-LABEL: MACLongTest5: +; CHECK: mov [[RDLO:r[0-9]+]], r0 +; CHECK: umlal [[RDLO]], r1, r0, r0 +; CHECK: mov r0, [[RDLO]] + + %conv.trunc = trunc i64 %c to i32 + %conv = zext i32 %conv.trunc to i64 + %conv1 = zext i32 %b to i64 + %mul = mul i64 %conv, %conv + %add = add i64 %mul, %c + ret i64 %add +} |