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| author | Chris Lattner <sabre@nondot.org> | 2007-11-27 22:41:52 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-11-27 22:41:52 +0000 |
| commit | a3f61df4ff4549da3cef1ae70427a4c8ca858c69 (patch) | |
| tree | edf66e92bf469417777b5c9fa06364cd7b61409d /lib/Target/ARM/README.txt | |
| parent | f1b1c5ed1a91cf23cfa65a24caefce6235d2fed3 (diff) | |
| download | external_llvm-a3f61df4ff4549da3cef1ae70427a4c8ca858c69.zip external_llvm-a3f61df4ff4549da3cef1ae70427a4c8ca858c69.tar.gz external_llvm-a3f61df4ff4549da3cef1ae70427a4c8ca858c69.tar.bz2 | |
several entries got significantly better, though they still aren't done.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44382 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/README.txt')
| -rw-r--r-- | lib/Target/ARM/README.txt | 58 |
1 files changed, 18 insertions, 40 deletions
diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt index da249b7..068c441 100644 --- a/lib/Target/ARM/README.txt +++ b/lib/Target/ARM/README.txt @@ -186,24 +186,19 @@ double bar(double x) { } _bar: - sub sp, sp, #16 - str r4, [sp, #+12] - str r5, [sp, #+8] - str lr, [sp, #+4] - mov r4, r0 - mov r5, r1 - ldr r0, LCPI2_0 - bl _foo - fmsr f0, r0 - fcvtsd d0, f0 - fmdrr d1, r4, r5 - faddd d0, d0, d1 - fmrrd r0, r1, d0 - ldr lr, [sp, #+4] - ldr r5, [sp, #+8] - ldr r4, [sp, #+12] - add sp, sp, #16 - bx lr + stmfd sp!, {r4, r5, r7, lr} + add r7, sp, #8 + mov r4, r0 + mov r5, r1 + fldd d0, LCPI1_0 + fmrrd r0, r1, d0 + bl _foo + fmdrr d0, r4, r5 + fmsr s2, r0 + fsitod d1, s2 + faddd d0, d1, d0 + fmrrd r0, r1, d0 + ldmfd sp!, {r4, r5, r7, pc} Ignore the prologue and epilogue stuff for a second. Note mov r4, r0 @@ -501,32 +496,15 @@ Should compile to use SMLAL (Signed Multiply Accumulate Long) which multiplies two signed 32-bit values to produce a 64-bit value, and accumulates this with a 64-bit value. -We currently get this with v6: +We currently get this with both v4 and v6: _foo: - mul r12, r1, r0 - smmul r1, r1, r0 - smmul r0, r3, r2 - mul r3, r3, r2 - adds r3, r3, r12 - adc r0, r0, r1 + smull r1, r0, r1, r0 + smull r3, r2, r3, r2 + adds r3, r3, r1 + adc r0, r2, r0 bx lr -and this with v4: - -_foo: - stmfd sp!, {r7, lr} - mov r7, sp - mul r12, r1, r0 - smull r0, r1, r1, r0 - smull lr, r0, r3, r2 - mul r3, r3, r2 - adds r3, r3, r12 - adc r0, r0, r1 - ldmfd sp!, {r7, pc} - -This apparently occurs in real code. - //===---------------------------------------------------------------------===// This: |