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rs6000: Fix a mistake in cstore_si_as_di (PR68865, PR68879)

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convert_move does not know how to zero-extend a constant integer to the
target mode -- simply because it does not know the source mode.  As a
result, 32-bit SImode with the high bit set would be effectively sign-
extended instead of zero-extended.

This patch fixes it.


	PR target/68865
	PR target/68879
	* config/rs6000/rs6000.md (cstore_si_as_di): Force all operands
	into registers.

From-SVN: r231621
This commit is contained in:
Segher Boessenkool 2015-12-14 17:13:33 +01:00 committed by Segher Boessenkool
parent 150cf34781
commit 755cd5a907
2 changed files with 9 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2015-12-14 Segher Boessenkool <segher@kernel.crashing.org>
PR target/68865
PR target/68879
* config/rs6000/rs6000.md (cstore_si_as_di): Force all operands
into registers.
2015-12-14 Richard Biener <rguenther@suse.de>
Revert accidentially applied

2
gcc/config/rs6000/rs6000.md
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@ -10631,6 +10631,8 @@
int uns_flag = unsigned_comparison_operator (operands[1], VOIDmode) ? 1 : 0;
enum rtx_code cond_code = signed_condition (GET_CODE (operands[1]));
operands[2] = force_reg (SImode, operands[2]);
operands[3] = force_reg (SImode, operands[3]);
rtx op1 = gen_reg_rtx (DImode);
rtx op2 = gen_reg_rtx (DImode);
convert_move (op1, operands[2], uns_flag);